.middle > div {
    border: 1px solid gray;
}

.middle > div > div:nth-child(2) {
    padding: 10px;

}

.title {
    border-bottom: 1px solid gray;
}


/*--------------------留言内容-------------------------*/
.middle > div > div:nth-child(2) {
    display: flex;
    justify-content: center;
}

.middle > div > div:nth-child(2) > div {

    /*border: 1px solid blue;*/
}

.middle > div > div:nth-child(2) > div > div:nth-child(1) > div:nth-child(1) > div {
    display: flex;

}

.middle > div > div:nth-child(2) > div > div:nth-child(1) > div:nth-child(1) {
    display: flex;
    justify-content: center;

}

.middle > div > div:nth-child(2) > div > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) {
    display: flex;
    align-items: center;
}

.middle > div > div:nth-child(2) > div > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) {
    color: orange;
    font-size: 30px;
}

.middle > div > div:nth-child(2) > div > div:nth-child(1) > div:nth-child(1) > div:nth-child(1) > div:nth-child(2) {
    color: gray;
}

/*------------------提交内容---------------------------------*/
.middle > div > div:nth-child(2) > div > div:nth-child(2) {
    display: flex;
    justify-content: center;
}

/*input*/
[mywidth=my] {
    width: 600px;
    background-color: rgb(238, 238, 238);
    border: 1px dashed gray;
    line-height: 30px;
}

form > div > div {
    line-height: 30px;
}

.textarea {
    line-height: 20px;
    height: 100px;
}

/*----------------------button----------------*/
form > div:last-child {
    display: flex;
    justify-content: center;
}

input[type=submit] {
    margin: 20px 0;
    padding: 10px 40px;
    background-color: orange;
    border: none;
    cursor: pointer;
    color: white;
    border-radius: 45px;
    box-shadow: 1px 1px 2px 2px red;
}